Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a0f32c255e7289…

MALICIOUS

PDF

35.3 KB Created: 2021-06-30 07:15:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fda3e14075c7023fa71c777cc4a50f82 SHA-1: 38895bd264cdfe6af3008196c634891ed9a9e5b1 SHA-256: b8a0f32c255e72898eacdd8d165c13bd3391273515bd9cb24e77718b93b78530
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for free game currency, specifically mentioning 'free Robux' and 'game hack'. It includes a direct link to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/i-got-free-robux-from-this-game-hack. This redirector likely serves as a gateway to further malicious content or downloads, consistent with a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.co/app/431946152/i-got-free-robux-from-this-game-hack In PDF document text
    • https://library.stikeswnpalu.ac.id/repository/game-roblox-free-download_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-tiktok-fans-no-verification_GM835599320.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/krnl-download_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/best-roblox-hack-sites_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-jailbreak-cheat-engine-money_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/pin-robux-free-2021_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/cheats-for-jailbreak-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/funny-roblox-outfits-and-free-outfits_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-time-hack_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/robux-hack-inspeccionar_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000328b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x328B 22400 bytes
SHA-256: 55567302d50ef968587571924c49572102a63d483b1a0aca90affb2ede0deb16
font_01_sfnt_off00006429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6429 19368 bytes
SHA-256: 76b355e3068c087129154c4b7d5011a8263d0144b4117508a34f4fe4b1fffbad

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